This study investigates the operational window of methane reforming in the presence of CO2 sorbent CaO-Cal(2)Al(14)O(33) (85:15 wt). Atmospheric experiments were conducted, at constant steam to methane ratio and catalyst mass under various sorbent masses, total feed flows, and temperatures. When CaO-Cal(2)Al(14)O(33) is utilized at 650 degrees C, the equilibrium is shifted, for all the sorbent masses and the total flow rates studied, to higher hydrogen concentration (>93%) compared to conventional steam reforming (>77%). The methane conversion attained, at 650 degrees C, is 95%. A mathematical model was developed to describe the kinetics of the CaO-Ca12Al14O33 carbonation. The predicted decrease in the carbonation rate due to the lowering in temperature (650 to 550 degrees C) agrees reasonably well with the observed 24% loss of methane conversion for the same temperature shift.